The jacks have a pressure switch mounted to the jack tube and connected with a right angle hydraulic male connections. The connection from jack tube to right angle tube is leaking at where it meets the jack tube. I can only get the switch to turn about one fifth of the radius and it is not enough to stop the leaking. I guess I'll have to get another right angle fitting or ?

Oh, can I use Teflon tape to seal the threads that carry hydraulic fluid?

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I tried using teflon but it wasn't stopping the leaking. Found I was dealing with pipe threads not hydraulic threads. My local NAPA store had a preassembled pipe used for grease guns that worked perfectly. Just saved myself one new HWH jack: $700 with $8 in repare parts.